Stroke. 2002;33:735-742
doi: 10.1161/hs0302.104615
doi: 10.1161/hs0302.104615
(Stroke. 2002;33:735.)
© 2002 American Heart Association, Inc.
Original Contributions |
Old Microbleeds Are a Potential Risk Factor for Cerebral Bleeding After Ischemic Stroke
A Gradient-Echo T2*-Weighted Brain MRI Study
From the Cerebrovascular Disease Center (N.N., M.K.B.-L., L.D., J.H., F.P., P.T.), Department of Radiology (N.N., M.H., J.F.D., J.C.F.), and CREATIS UMR CNRS 5515, and Biostatistical Unit of UCB Lyon I (P.A.), Lyon, France.
Correspondence to Pr N. Nighoghossian, Service de Neurologie B Pr P Trouillas, Urgences Neurovasculaires, Hôpital Neurologique, 59 Bd Pinel, Lyon, 69003, France. E-mail norbert.nighoghossian{at}chu-lyon.fr
Background and Purpose— T2*-weighted gradient-echo MRI is known to detect old microbleeds (MBs), considered indicative of microangiopathy. MBs might be a potential risk factor for early cerebral bleeding (CB) after ischemic stroke. Therefore, we assessed the impact of MBs on the occurrence of CB after cerebral infarction.
Methods— We included prospectively stroke patients who had documented ischemic damage. The imaging protocol involved baseline CT scan, T2*-weighted gradient-echo MRI, diffusion-weighted imaging, T2-weighted imaging, and magnetic resonance angiography and had to be performed within 24 hours after symptom onset. The assessment of CB with T2*-weighted gradient-echo sequence necessitated a focal area of signal loss either within the ischemic area revealed by diffusion-weighted imaging or remote from it. Old MBs were defined on T2*-weighted images as homogeneous rounded areas of signal loss without surrounding edema. CT scan was systematically repeated within the first week to verify CB as diagnosed by the T2* weighted sequence.
Results— One hundred patients (mean age, 60±13 years; range, 19 to 83 years; 58 men, 42 women) met the inclusion criteria. MBs were seen in 20 patients on T2*-weighted imaging. Multivariate logistic regression analysis revealed that age, diabetes, previous use of antithrombotic drugs, evidence of an atherothrombotic source of stroke, and lacunar infarct were significantly associated with MBs (P<0.0001). CB was diagnosed in 26 patients: at the acute stage by T2*-gradient echo sequence in 18 patients and with CT scan performed within the first week in 8 patients. Multivariate logistic regression analysis showed that baseline National Institutes of Health Stroke Scale score, diabetes, and MBs were considered significant and independent predictors of CB (P<0.001).
Conclusions— Although the pathogenesis of CB after ischemic stroke is multifactorial, the increased observation of CB in patients with MBs suggests that the associated vascular vulnerability contributes to CB.
Key Words: echo-planar imaging • hemorrhagic transformation • magnetic resonance imaging • microbleeds
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